Electric filter



Feb. 13, 194.0.

KARL-HEINRICH KRAMBEER ELECTRIC FILTER Filed July 26, 1938 INVENTOR KARLHE/MQ/CH KRA MBFER 7kg gm.

ATTORNEY Patented Feb. 13, 1940. r

UNITED STATES PATENT OFFICE 2,190,430 ELECTRIC FILTER Karl-Heinrich Krambeer, Berlin-Spandau, Germany, assignor to Siemens & Halske, Aktiengesellschaft, Siemensstadt, near Berlin, Germany, a corporation of Germany Application July 26, 1938, Serial No. 221,341

Germany September 11, 1937 3 Claims. (01. 178-44-) In electric filters, more especially in wave filters In accordance with the invention, it will be used in casehof hiel'l fle uenc e, i is 6 5 5 3, especially favorable to use for all condensers a in View e require ransmission proper ies, common shield, for instance having the shape 0 to maintain the injurious capacitiesas low as a plate or tube, whereby the capacity between t p l h pr n nv n i n prov de a these points is to be maintained low through means f reducing h efiective injurious surfac suitable shielding of the plates or layers A1, D, A2 which determines the injurious capacities so that by means of a common layer s. In the Figures 2 the lowest injurious capacities can be obtained. and 3 such condensers are shown with a common In accordance with the invention, in electric layer, Fi ur 2 sho s plate shaped layers A1, D,

10 filters or the like, the shields of the individual A2 a a Common m t shaped hi ld 3, Figure 10 Condensers fOrmed y a layer are Connected 0 3 shows such a condenser having a tubular shape. each Other and the condensers a e mount d W The condensers having a common zero layer as n a Co mo as close to each other. In acshown in Figures 2 and 3 are mounted in a comcordance with a further novel feature the indimen casing S ch s shown at G in dash lines in vidual condensers have a common shield formed Figure 1,

y a Common l y With the novel filter arrangement, in many The invention will be descrlbed in greate the injurious surface and thus also the indetail 1 3 refelgfice et g gg fille ll Fl jurious capacity can be reduced to approximately We Slows a er cllcul em 0 Y e one-third of the low capacity values existing in 3 12? 35311 221 3 t h glgei grrl 3 szg s g rl l gl g z the high-frequency field and at the same volume 20 of the cup. the electrodes of which are plate shaped and tu- What is Claimed bular respectively. in tllfllgure 1 E m 13 2 1. Electric filter comprising a series path conm ggfi gl l t pgi ie lgf gl s z a g h gg g 152 g taining a pair of condensers, a shunt path con- 2 tainin a condenser and an inductance, said conof the filter contains the condensers C2, C3, while s; having a termina} in common an indi i s r fs z i gi s fggfifig vidual shield for each condenser, and a common 0 c n e 1 shield enclosing all said condensers.

nfected to eacn other at bwlre pref" 2. Electric filter according to claim 1 wherein e1 ably p As g a g 2 the electrodes of the several condensers are in one layer of we con ener 5 16 e 5 e the form of plates, and the shield comprises other layer whereby the sh1eld1ng layers are con- 191W hate? 056d between the condenser lates nected to a common point so that only one layer p 1 j t 1 1 of each condenser can have a capacity with re 1 9 n Ler i mg 0 0 w ls v Spect to the f bl grounded Wire The tie electrodes of the several condensers are u u- 85 Condensers C1, C2, C3 are mounted in a metal lar and concentrically arranged, and the shield casing G, such as for instance a condenser cup r Comprises tubular members interposed between can as indicated by the dash lines. In this Way adjacent condenser electrodes.

the effective injurious surface of the common point s is substantially reduced relative to the KARL-HEINRICH KRAMBEER. a

can. 

